That pistol grip with the finger grooves I bought used for $10, it is a First Samco G27, ambi. I wish I could have found another one at that price. The other is a Magpul I got for $20. It was on my homebuilt but I really like how these with the filled in thumb web area feel.
I would have not replaced my upper except I got that one and the handguard for $150 and he added the Eagle, Globe and Anchor on it. They including the charging handle are Nordic, you can tell they stamp a capital "N" underneath them, although the FA and Dustcover came from Brownells and the casting has a "keyhole" on it.

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Grover Oathkeeper